Strange Noise Margin Behaviour

This is a discussion on Strange Noise Margin Behaviour within the Sky Broadband help forums, part of the Sky Broadband help and support category; I've noticed recently that if a plug in an ethernet cable to my router, plug in only its not actually ...

Strange Noise Margin Behaviour

I've noticed recently that if a plug in an ethernet cable to my router, plug in only its not actually connected to anything, the noise margin increases by as much as a couple of db. If I the plug the other end of the cable into a homeplug that's not actually switched on at the mains it'll increase even more by a small amount.